Small-sized fish as possible seed dispersers: disclosing novel fish and plant species interactions in the Pantanal wetland

Silveira, Roberto de Moraes Lima; Leão-Neto, Wilson Mamedes; Silva, Fernando Henrique Barbosa da

doi:10.1080/01650521.2019.1669422

Cited by 7 publications

(7 citation statements)

References 29 publications

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“…The provision of these services depends on the flood pulse from upstream regions which delivers nutrients, sediments, fauna, and plant propagules to the floodplain and maintains large areas flooded for long periods (Girard et al, 2010). This natural behavior of flood-pulsed rivers conditions multiple ecological processes in the river-floodplain system, including the richness, abundance, and distribution of fauna, flora, and human activities in the region (Junk et al, 1989;Oliveira et al, 2019;Silveira et al, 2020). Constructed and planned dams in the Upper Paraguay Basin have the potential to alter nutrient cycling, sedimentation processes downstream, and the flood pulse (Ivory et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Dam-Induced Hydrologic Alterations in the Rivers Feeding the Pantanal

Ely

Fantin-Cruz

Tritico

et al. 2020

Front. Environ. Sci.

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Tropical river basins have experienced dramatically increased hydropower development over the last 20 years. These alterations have the potential to cause changes in hydrologic and ecologic systems. One heavily impacted system is the Upper Paraguay River Basin, which feeds the Pantanal wetland. The Pantanal is a Ramsar Heritage site and is one of the world's largest freshwater wetlands. Over the past 20 years, the number of hydropower facilities in the Upper Paraguay River Basin has more than doubled. This paper uses the Indicators of Hydrologic Alteration (IHA) method to assess the impact of 24 of these dams on the hydrologic regime over 20 years (10 years before and 10 years after dam installation) and proposes a method to disentangle the effects of dams from other drivers of hydrologic change using undammed “control” rivers. While most of these dams are small, run-of-the-river systems, each dam significantly altered at least one of the 33 hydrologic indicators assessed. Across all studied dams, 88 of the 256 calculated indicators changed significantly, causing changes of 5–40%, compared to undammed reaches. These changes were most common in indicators that quantify the frequency and duration of high and low pulses, along with those for the rate and frequency of hydrologic changes. Importantly, the flow regime in several undammed reaches also showed significant alterations, likely due to climate and land-use changes, supporting the need for measurements in representative control systems when attributing causes to observed change. Basin-wide hydrologic changes (in both dammed and undammed rivers) have the potential to fundamentally alter the hydrology, sediment patterns, and ecosystem of the Pantanal wetland. The proposed refinement of the IHA methods reveals crucial differences between dam-induced alteration and those assigned to other drivers of change; these need to be better understood for more efficient management of current hydropower plants or the implementation of future dams.

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Section: Introductionmentioning

confidence: 99%

Dam-Induced Hydrologic Alterations in the Rivers Feeding the Pantanal

Ely

Fantin-Cruz

Tritico

et al. 2020

Front. Environ. Sci.

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“…The reproductive strategy of fish that follow the seasonal strategy coincides with the flood season and includes all native Iraqi fish such as (A. [35]. This could be because small fish are more successful at offering shelter and food, especially in the seasonal shallow wetlands; on the other hand, the small individuals of fish in the vegetation marshes are more protective against predators compared to deep or open water where large fish live [36].…”

Section: Discussionmentioning

confidence: 99%

The Impact of Hydrological Changes on Fish Assemblages in the Zachery Marshes of Southern Iraq

Abdullah

2023

IOP Conf. Ser.: Earth Environ. Sci.

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The present study was implemented in the Zachery Marsh as part of the middle marshes north of Bashar Province from January to December 2022 to investigate the impact of the seasons’ oscillation between drought and flooding on fish assemblage abundance, size spectrum, and ecological indices. Three stations were selected to collect samples of fish. The specimens were monthly gathered with different fishing tools, including fixed gillnets, cast nets, and electrofishing. The water temperature ranged from 12.32 to 34.03 °C, the salinity varied from 1.75 PSU to 2.89 PSU, and the pH fluctuated between 7.47 and 8.43. The rate of change in water depth in the low flat regions fluctuated from 27 cm in September to 76 cm in April. The mean water depth in rivers, small pits, and canals varied from 45 cm in October to the highest, 121 cm in March. In the seasonal regions, the average depth ranged from zero in July, August, September, and October to 40 cm in April. The current study documented 18 fish species belonging to 16 genera and 9 families from Zachery Marsh, all of them affiliated with the Osteichthyes class. Cyprinidae was the most abundant family, including six species. The species Planiliza abu, the most abundant species, formed 28.44%, Carassius gibelio constituted 20.27%, and Orechromis aureus represented 18.52%. The dominance index (D3) of the three dominant species was 67.23%. The size spectrum of the most commercial species was determined. The diversity index value ranged from 1.64 in August to 2.08 in June, the evenness index varied between 0.69 in May and 0.91 in December, and the richness index values fluctuated from 1.47 in August to 2.28 in June. Resident species represented 88.02%, seasonal species formed 6.08%, and the occasional fish species counted for 5.90%. The present study concludes that the fluctuation between drought and flooding has a critical role in the composition of fish assemblages, particularly in seasonal marshes that are subjected to extreme conditions. The fish evolve several reproductive strategies in these difficult conditions in order to survive and continue.

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“…Some ichthyochory studies have reported the presence of several fruit species in the diet of Neotropical frugivorous fishes (Correa et al, 2007, 2015, 2016; Costa‐Pereira, Severo‐Neto, Yule, & Tinti‐Pereira, 2011; Galetti et al, 2008; Silveira, Leão‐Neto, & Barbosa, 2019; Silveira & Weiss, 2014). Thus, understanding the patterns of fruit selection can help us to infer the spatial patterns of seed deposition resulting from the interaction between fish and plants.…”

Section: Discussionmentioning

confidence: 99%